Hygienic resonator for telephones or other sound-transmitting devices.



No. 660,796., I Patented Oct. 30, I900. 1

' a. HOGLUND & c. m. HEDMAN. HYGIENIC RESONATOR FUR TEL EPHONES OR OTHERSOUND TRANSMITTING DEWCES.

(Application filed Dec. 18, 1899.)

(No Model.)

UNITED STATES PATENT ()FFICE.

GUSTAVUS HOGLUND AND CARL M. HEDMAN, or Ci-ncAco, ILLINOIS,

ASSIGNORS or ONE-HALF TO onARLEs BERG AND MAURICE LUN- DIN, OF SAMEPLACE.

HYGIENIC RESONATOR FOR TELEPHONES OR OTHER SOUND-TRANSMITTING DEVICES.

SPECIFICATION forming part of Letters Patent No. 660,796, dat d O tobe30, 1900.

Application filed December 18, 1899. Serial No. 740.663. (No model.)

To aZZ whmn it may concern:

Be it known that we, GUsrAvUs HOGLUND and CARL M. HEDMAN, citizens ofthe United States, residing at Chicago, in the county of Cook and Stateof Illinois, have invented certain new and useful Improvements inHygienic Resonators for Telephones or other Sound-Transmitting Devices,of which the following is a specification.

This invention relates to improvements in devices to be usedforincreasing, magnifying, or reinforcing sounds and for rendering themmore clear and distinct, and while it is more especially applicable totelephones, and we have shown and will describe it in connectiontherewith, yet it is adapted for use on various kinds of instrumentsemployed for the transmission of soundsuch as speaking-tubes,eartru1npets, phonographs, graphophones, and analogous devices-and forthis reason we do not desire to limit ourselves in its use to anyspecific sound-transmitting instrument, but may combine it with anysuitable device for transmitting the human voice, instrumental music, orother sounds; and it consists in certain peculiarities of theconstruction, novel arrangement, and operation of the parts thereof, aswill be hereinafter more fully set forth and specifically claimed.

One object of our invention is to provide a resonator which shall causethe sounds to be delivered in a clear and distinct manner andinincreased volume and the timbre thereof preserved and which shall besimple and inexpensive in construction and readily attached to asound-transmitting instrument.

Another object of our invention is to render it hygienic by soconstructing it that the germs or microbes from the breath will not findready lodgment, and the parts may be easily cleansed.

In order to enable others skilled in the art to which our inventionpertains to make and use the same, We will now proceed to describe it,referring to the accompanying drawings, in which Figure 1 is a verticalcentral sectional View taken on line 1 1 of Fig. 2, showing ourresonator as applied to a telephone-transmitter and illustrating aportion of said transmitter in elevation. Fig. 2 is a face view of theresonator, showing it attached to the mouthpiece of the transmitter.Fig. 3 is a view in side elevation of a modified form of the resonator,showing it attached to a telephone of a modified form; and Fig. 4 is aview, partly in section and partly in elevation, of our resonator,showing it attached to a telephonetransmitter of still anothermodification.

Similar letters refer to like parts throughout the different views ofthe drawings.

A represents the box or casing of a tele phonetransmitter, which may beprovided with a tubular extension a, leading to the diaphragm. (Notshown.) Secured to the extension Cb is a concave mouthpiece B, a centralopening in which communicates with the opening in said tubularextension. Secured to the concave surface of the mouthpiece B isaresonator C, which may be made of any suitable size and material, butpreferably of hard rubber. This piece or resonator is provided atsuitable points on its edge with legs or sup portin g-pieces c, whichmay be fastened to the mouthpiece B by means of screws 0 or otherwise.

By reference to Figs. 1 and 2 of the drawings it will be seen that theedge or rim of the resonator or piece 0 is located at a slight distancefrom the edge and surface of the mouthpiece, so as to allow thesound-waves to pass therebetween and rebound from the mouthpiece andresonator, as indicated by dotted lines.

In Fig. 3 of the drawings we have shown a modification in theconstruction of the transmitter A which consists in omitting the tubularextension at and concave mouthpiece B and providing its front portionwith an opening a, leading to the diaphragm, in which case we may usearesonator of the form shown in Fig. l of the drawings or may employ oneof the shape illustrated in Fig. 3, which is somewhat conical in shape.In this modification the resonator O is secured to the front surface ofthe transmitter and at a slight distance therefrom, as is clearly shown,but so that the edge or periphery of the resonator will circumscribe theopening in the transmitter.

In Fig. at of the drawings we have shown another modified form of thetransmitter A which is provided with a tubular extension a to which maybe secured a flaring tube a which extends into the cavity of theresonator C, which is preferably of the same shape as that illustratedin Fig. 1 of the drawings. In this modification of the transmitter theresonator is secured to its front surface and at a slight distancetherefrom, as in the other construction.

While we have shown and described the resonator as being connected witha telephonetransniitter, yet it is evident that it may be applied tospeaking-tubes, ear-trumpets, and other sound-transmitting devices. Wehave also shown the resonator as being concave in form; but it may bemade conoavo con vex or convex-concavo or with a hollow or concavity inits surface adjacent to the sound-transmitting device and with its outersurface convex or conical or round. In other words, we do not desire tolimit ourselves to any specific form of the resonator or to the means ofconnecting it with the sound -transmitting device, as we may secure itin a mouthpiece of greater size than the resonator, as shown in Fig. 1of the drawings, or we may attach it directly to the front of thetransmitter-casing, as shown in Fig. 3, or may extend the mouthpiece orflaring tube into the cavity of the resonator, as shown in Fig. 4-,without departing from the spirit of our invention, the

broad idea of which is the application of a hollow piece applied to asound-transmitting device, with the cavity of the resonator locatedabout the opening of the transmitter.

In using our device it is only necessary to speak or create a sound inany suitable direction near the resonator, when the soundwaves strikingits external surface will be carried over its rim or periphery to thesurface of its support, when they will rebound or be reflected to thecavity of the resonator, from whence they will rebound or be reflectedto the diaphragm or within the tube of the sound-transmitting device.

Having thus fully described our invention, what we claim as new, anddesire to secure by Letters Patent, is

1. A resonator for a sound-transmitting device comprising a concavepiece, with its cavity circumscribing and adjacent to the opening of thetransmitter, substantially as described.

2. The combination with a concave mouthpiece, of a piece concave on oneside and convex on the other secured therein at a slight distancethereform and with its cavity adjacent to the mouthpiece andcircumscribing the opening of the transmitter, substantially asdescribed.

GUSTAVUS HOGLUN D. CARL M. HEDMAN.

Witnesses:

CHAS. C. TILLMAN, A. GUsTAFsoN.

